Buggy code:
public class DataDefinition implements Cloneable { private boolean locked = false ; private final Map < String , AttributeType > attributeTypes = new HashMap < String , AttributeType > ( ) ; private final Map < String , HierarchyBuilder < ? > > builders = new HashMap < String , HierarchyBuilder < ? > > ( ) ; private final Map < String , Hierarchy > hierarchies = new HashMap < String , Hierarchy > ( ) ; private final Map < String , MicroAggregationFunction > functions = new HashMap < String , MicroAggregationFunction > ( ) ; private final Map < String , DataType < ? > > dataTypes = new HashMap < String , DataType < ? > > ( ) ; private final Map < String , Integer > minGeneralization = new HashMap < String , Integer > ( ) ; private final Map < String , Integer > maxGeneralization = new HashMap < String , Integer > ( ) ; @ Override public DataDefinition clone ( ) { } public AttributeType getAttributeType ( final String attribute ) { } public DataType < ? > getDataType ( final String columnName ) { } public String [ ] [ ] getHierarchy ( final String attribute ) { } public HierarchyBuilder < ? > getHierarchyBuilder ( final String attribute ) { } public Hierarchy getHierarchyObject ( final String attribute ) { } public Set < String > getIdentifyingAttributes ( ) { } public Set < String > getInsensitiveAttributes ( ) { } public int getMaximumGeneralization ( final String attribute ) { checkQuasiIdentifier ( attribute ) ; Integer result = maxGeneralization . get ( attribute ) ; if ( result != null ) return result ; if ( ( this . getHierarchy ( attribute ) ) != null ) { String [ ] [ ] hierarchy = this . getHierarchy ( attribute ) ; if ( ( ( hierarchy . length ) == 0 ) || ( ( hierarchy [ 0 ] ) == null ) ) { return 0 ; } else { return ( hierarchy [ 0 ] . length ) - 1 ; } } else { <START_BUG> throw new IllegalStateException ( ( ( "No<seq2seq4repair_space>materialized<seq2seq4repair_space>hierarchy<seq2seq4repair_space>specified<seq2seq4repair_space>for<seq2seq4repair_space>attribute<seq2seq4repair_space>(" + attribute ) + ")" ) ) ; <END_BUG> } } public MicroAggregationFunction getMicroAggregationFunction ( final String attribute ) { } public int getMinimumGeneralization ( final String attribute ) { } public Set < String > getQuasiIdentifiersWithGeneralization ( ) { } public Set < String > getQuasiIdentifiersWithMicroaggregation ( ) { } public Set < String > getQuasiIdentifyingAttributes ( ) { } public Set < String > getSensitiveAttributes ( ) { } public boolean isHierarchyAvailable ( String attribute ) { } public boolean isHierarchyBuilderAvailable ( String attribute ) { } public boolean isLocked ( ) { } public boolean isMaximumGeneralizationAvailable ( String attribute ) { } public boolean isMinimumGeneralizationAvailable ( String attribute ) { } public void read ( DataDefinition other ) { } public void resetAttributeType ( String attr ) { } public void resetHierarchy ( String attr ) { } public void resetHierarchyBuilder ( String attr ) { } public void resetMaximumGeneralization ( String attr ) { } public void resetMicroAggregationFunction ( String attr ) { } public void resetMinimumGeneralization ( String attr ) { } public void setAttributeType ( final String attribute , final AttributeType type ) { } public void setAttributeType ( final String attribute , final HierarchyBuilder < ? > builder ) { } public void setDataType ( final String attribute , final DataType < ? > type ) { } public void setHierarchy ( String attribute , Hierarchy hierarchy ) { } public void setHierarchy ( String attribute , HierarchyBuilder < ? > builder ) { } public void setMaximumGeneralization ( final String attribute , final int maximum ) { } public void setMicroAggregationFunction ( String attribute , MicroAggregationFunction function ) { } public void setMinimumGeneralization ( final String attribute , final int minimum ) { } private void checkLocked ( ) throws IllegalStateException { } private void checkNullArgument ( Object argument , String name ) throws IllegalArgumentException { } private void checkQuasiIdentifier ( String attribute ) throws IllegalArgumentException { } private Set < String > getAttributesByType ( int type ) { } protected void materializeHierarchies ( DataHandle handle ) { } protected void parse ( ImportAdapter adapter ) { } protected void setLocked ( boolean locked ) { } }

Fix:
return 0 ;